<template>
  <view>
    <!--使用自定义搜索组件-->
    <mysearch @myclick="gotoSearch"></mysearch>
    <!-- <mysearch :bgcolor="'#000000'" :radius="3"></mysearch> -->
    
    <view class="scroll-view-container">
      <!--左侧的滑动区-->
      <scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh + 'px'}">
        <block v-for="(item, i) in cateList" :key="i">
          <view :class="['left-scroll-view-item', i === active ? 'active' : '']" @click="activeChange(i)">{{item.cat_name}}</view>
        </block>
      </scroll-view>
      <!--右侧的滑动区-->
      <scroll-view scroll-y="true" :style="{height: wh + 'px'}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
          <!-- 二级分类的标题 -->
          <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
          <!-- 当前二级分类下的三级分类列表 -->
          <view class="cate-lv3-list">
            <!-- 三级分类的item项 -->
            <view class="cate-lv3-item" v-for="(item3, i3) in item2.chilren" :key="i3" @click="gotoGoodsList(item3)">
              <!-- 三级分类的图片 -->
              <image :src="item3.cat_icon"></image>
              <!-- 三级分类的文本 -->
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    <!--使用uni.getSystemInfoSync获取不同机型的屏幕高度-->
    </view>
  </view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badge.js'
  
  export default {
    mixins: [badgeMix],
    data() {
      return {
        //当前设备可用高度windowHeight(wh)
        wh: 0,
        cateList: [],
        active: 0,
        //二级分类的列表
        cateLevel2: [],
        scrollTop: 0
      };
    },
    onLoad() {
      const sysInfo = uni.getSystemInfoSync()
      //console.log(sysInfo)
      this.wh = sysInfo.windowHeight - 50
      
      this.getCateList()
    },
    methods: {
      //获取分类列表的数据
      async getCateList() {
        const {data: res} = await uni.$http.get('/categories')
        if(res.meta.status !== 200) return uni.$showMsg()
        this.cateList= res.message
        
        //为2级分类赋值
        this.cateLevel2 = res.message[0].children
      },
      activeChange(i) {
        this.active = i
        
        //重新为二级分类赋值
        this.cateLevel2 = this.cateList[i].children
        
        this.scrollTop = this.scrollTop == 0 ? 1 : 0
      },
      //跳转到商品列表页面
      gotoGoodsList(item) {
        uni.navigateTo({
          url: './subpkg/goods_list/goods_list?cid=' + item.cat_id
        })
      },
      gotoSearch() {
        uni.navigateTo({
          url: '../../subpkg/search/search'
        })
      }
    }
  }
</script>

<style lang="scss">
  .scroll-view-container {
    display: flex;
    
    .left-scroll-view {
      width: 120px;
      
      .left-scroll-view-item {
        background-color: #F7F7F7;
        line-height: 60px;
        text-align: center;
        font-size: 12px;
        
        &.active {
          background-color: #FFFFFF;
          position: relative;
          
          &::before {
            content: ' ';
            display: block;
            width: 3px;
            height: 30px;
            background-color: #C00000;
            position: absolute;
            top: 50%;
            left: 0;
            transform: translateY(-50%);
          }
        }
      }
    }
  }
  
  .cate-lv2-title {
    font-size: 12px;
    font-weight: bold;
    text-align: center;
    padding: 15px 0;
  }
  
  .cate-lv3-list {
    display: flex;
    flex-wrap: wrap;
    .cate-lv3-item {
      width: 33.33%;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      margin-bottom: 10px;
       
      iamge {
        width: 60px;
        height: 60px;
      }
      
      text {
        font-size: 12px;
        
      }
    }
  }
</style>
